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Kubernetes on CloudStack with coreOS

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Sebastien Goasguen
Sebastien Goasguen

Intro to coreOS linux distributions and how it can be used to run docker based workloads in the cloud. coreOS instances can be started in a cloudstack cloud, it makes use of cloud-init basics to

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Kubernetes on CloudStack with coreOS Sebastien Goasguen @sebgoa Nov 11th 2014 London, England
Who am I ? • Apache CloudStack and licloud committer + PMC member • Looking at techs and how they work together • Half dev, half community manager, + half event planner
Today’s talk
Ugly slide #1 Docker containers Docker containers Docker containers KK** Docker KK** KK** containers Docker containers ccoorreeOOSS ccoorreeOOSS ccoorreeOOSS Cloud (e.g CloudStack Cloud (e.g CloudStack b baasseedd = = e exxoossccaalele)) Docker containers API calls to Kubernetes API
• Linux container (LXC +) • Application deployment • PaaS • Portability • Image sharing via DockerHub • Ease of packaging applications
Building docker images Fair use from http://blog.octo.com/en/docker-registry-first-steps/
+ config mgmt
CoreOS • Linux distribution • Rolling upgrades • Minimal OS • Docker support • etcd and fleet tools to manage distributed applications based on containers. • Cloud-init support • Systemd units
coreOS “OEM” http://github.com/coreos/coreos-overlay
coreOS “OEM” http://github.com/coreos/coreos-overlay
The cloudinit magic
CoreOS clustering • etcd HA key value store – Raft election algorithm – Writes when majority in cluster has committed update – e.g 5 nodes, tolerates 2 nodes failure • fleet distributed init system (schedules systemd units in a cluster) – Submits systemd units cluster wide – Affinity, anti-affinity, global “scheduling”
“coreOS is the first cloud OS dedicated to docker based application workloads”
“Where are you going to run coreOS ?”
IaaS Landscape
CloudStack clouds
Data Center Orchestrator AAPPII ((EECC22 && CCSS)) SSeellff--sseerrvviiccee PPoorrttaall MMeetteerriinngg IImmaaggee MMggmmtt.. DDaasshhbbooaarrdd IIddeennttiittyy MMggmmtt.. LLooaadd BBaallaanncceerrss FFWWss && VVPPNNss SSttoorraaggee CCoommppuuttee NNeettwwoorrkk
• IaaS Public cloud • Switzerland based • Apache CloudStack • Security groups, ssh key pairs • Offers coreOS templates (+ Debian, ubuntu, CentOS and even Windows)
CoreOS on exoscale
Starting containers #cloud-config coreos: units: - name: docker.service command: start - name: es.service command: start content: | [Unit] After=docker.service Requires=docker.service Description=starts ElasticSearch container [Service] TimeoutStartSec=0 ExecStartPre=/usr/bin/docker pull dockerfile/elasticsearch ExecStart=/usr/bin/docker run -d -p 9200:9200 -p 9300:9300 dockerfile/elasticsearch
Kubernetes • Docker application orchestration • Google GCE, rackspace, Azure providers • Deployable on CoreOS • Container replication • HA services
Kubernetes API
Kubernetes { "id": "redis-master-2", "kind": "Pod", "apiVersion": "v1beta1", "desiredState": { "manifest": { "version": "v1beta1", "id": "redis-master-2", "containers": [{ "name": "master", "image": "dockerfile/redis", "ports": [{ "containerPort": 6379, "hostPort": 6379 … "labels": { "name": "redis-master" } }
Kubernetes on CloudStack • Find a CloudStack cloud that supports CoreOS • Then use: https://github.com/runseb/kubernetes-exoscale • Libcloud to start nodes with coreOS template • User data to pass cloud-configs • Then start Kube* Service units with fleet
CClolouudd A APPI I Libcloud startup scripts Etcd cluster 5 nodes Etcd cluster 5 nodes Discovery service to Discovery service to bootstrap bootstrap PR welcome: https://github.com/runseb/kubernetes-Kubernetes cluster Kubernetes cluster 5 nodes 5 nodes Start Kube* services via fleet Run guestbook example Start Kube* services via fleet Run guestbook example
Docker container Docker container Docker container KK** Docker KK** KK** container Docker container ccoorreeOOSS ccoorreeOOSS ccoorreeOOSS Cloud (e.g CloudStack Cloud (e.g CloudStack b baasseedd = = e exxoossccaalele)) Docker container API calls to Kubernetes API
Questions and Thanks Sebastien Goasguen @sebgoa

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Kubernetes on CloudStack with coreOS

  • 1. Kubernetes on CloudStack with coreOS Sebastien Goasguen @sebgoa Nov 11th 2014 London, England
  • 2. Who am I ? • Apache CloudStack and licloud committer + PMC member • Looking at techs and how they work together • Half dev, half community manager, + half event planner
  • 4. Ugly slide #1 Docker containers Docker containers Docker containers KK** Docker KK** KK** containers Docker containers ccoorreeOOSS ccoorreeOOSS ccoorreeOOSS Cloud (e.g CloudStack Cloud (e.g CloudStack b baasseedd = = e exxoossccaalele)) Docker containers API calls to Kubernetes API
  • 5. • Linux container (LXC +) • Application deployment • PaaS • Portability • Image sharing via DockerHub • Ease of packaging applications
  • 6. Building docker images Fair use from http://blog.octo.com/en/docker-registry-first-steps/
  • 8. CoreOS • Linux distribution • Rolling upgrades • Minimal OS • Docker support • etcd and fleet tools to manage distributed applications based on containers. • Cloud-init support • Systemd units
  • 12. CoreOS clustering • etcd HA key value store – Raft election algorithm – Writes when majority in cluster has committed update – e.g 5 nodes, tolerates 2 nodes failure • fleet distributed init system (schedules systemd units in a cluster) – Submits systemd units cluster wide – Affinity, anti-affinity, global “scheduling”
  • 13. “coreOS is the first cloud OS dedicated to docker based application workloads”
  • 14. “Where are you going to run coreOS ?”
  • 17. Data Center Orchestrator AAPPII ((EECC22 && CCSS)) SSeellff--sseerrvviiccee PPoorrttaall MMeetteerriinngg IImmaaggee MMggmmtt.. DDaasshhbbooaarrdd IIddeennttiittyy MMggmmtt.. LLooaadd BBaallaanncceerrss FFWWss && VVPPNNss SSttoorraaggee CCoommppuuttee NNeettwwoorrkk
  • 18. • IaaS Public cloud • Switzerland based • Apache CloudStack • Security groups, ssh key pairs • Offers coreOS templates (+ Debian, ubuntu, CentOS and even Windows)
  • 20. Starting containers #cloud-config coreos: units: - name: docker.service command: start - name: es.service command: start content: | [Unit] After=docker.service Requires=docker.service Description=starts ElasticSearch container [Service] TimeoutStartSec=0 ExecStartPre=/usr/bin/docker pull dockerfile/elasticsearch ExecStart=/usr/bin/docker run -d -p 9200:9200 -p 9300:9300 dockerfile/elasticsearch
  • 21. Kubernetes • Docker application orchestration • Google GCE, rackspace, Azure providers • Deployable on CoreOS • Container replication • HA services
  • 23. Kubernetes { "id": "redis-master-2", "kind": "Pod", "apiVersion": "v1beta1", "desiredState": { "manifest": { "version": "v1beta1", "id": "redis-master-2", "containers": [{ "name": "master", "image": "dockerfile/redis", "ports": [{ "containerPort": 6379, "hostPort": 6379 … "labels": { "name": "redis-master" } }
  • 24. Kubernetes on CloudStack • Find a CloudStack cloud that supports CoreOS • Then use: https://github.com/runseb/kubernetes-exoscale • Libcloud to start nodes with coreOS template • User data to pass cloud-configs • Then start Kube* Service units with fleet
  • 25. CClolouudd A APPI I Libcloud startup scripts Etcd cluster 5 nodes Etcd cluster 5 nodes Discovery service to Discovery service to bootstrap bootstrap PR welcome: https://github.com/runseb/kubernetes-Kubernetes cluster Kubernetes cluster 5 nodes 5 nodes Start Kube* services via fleet Run guestbook example Start Kube* services via fleet Run guestbook example
  • 26. Docker container Docker container Docker container KK** Docker KK** KK** container Docker container ccoorreeOOSS ccoorreeOOSS ccoorreeOOSS Cloud (e.g CloudStack Cloud (e.g CloudStack b baasseedd = = e exxoossccaalele)) Docker container API calls to Kubernetes API
  • 27. Questions and Thanks Sebastien Goasguen @sebgoa